A comparative study of efficiency droop and internal electric field forInGaN blue lighting-emitting diodes on silicon and sapphire substrates

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/473506.do
DOI
10.1038/srep44814
Title
A comparative study of efficiency droop and internal electric field forInGaN blue lighting-emitting diodes on silicon and sapphire substrates
Description
This work was supported by the Pioneer Research Center Program(2014M3C1A3052580) and the Basic Science Research Program(2016R1D1A1B03932092) through the National Research Foundation of Korea,and the Future Semiconductor Device Technology Development Program(10044735) funded by MOTIE and KSRC.
abstract
We investigated the efficiency droop and polarization-induced internal electric field of InGaN blue light-emitting diodes (LEDs) grown on silicon(111) and c-plane sapphire substrates. The efficiency droop of the LED sample grown on silicon substrates was considerably lower than that of the identically fabricated LED sample grown on sapphire substrates. Consequently, the LED on silicon showed higher efficiency at a sufficiently high injection current despite the lower peak efficiency caused by the poorer crystal quality. The reduced efficiency droop for the LED on silicon was attributed to its lower internal electric field, which was confirmed by reverse-bias electro-reflectance measurements and numerical simulations. The internal electric field of the multiple quantum wells (MQWs) on silicon was found to be reduced by more than 40% compared to that of the MQWs on sapphire, which resulted in a more homogenous carrier distribution in InGaN MQWs, lower Auger recombination rates, and consequently reduced efficiency droop for the LEDs grown on the silicon substrates. Owing to its greatly reduced efficiency droop, the InGaN blue LED on silicon substrates is expected to be a good cost effective solution for future lighting technology.
provenance
Made available in Cube on 2018-09-28T10:21:26Z (GMT). No. of bitstreams: 0
language
English
author
Ryu, H. Y.
Jeon, K. S.
Kang, M. G.
Yuh, H. K.
Choi, Y. H.
Lee, J. S.
accessioned
2018-09-28T10:21:26Z
available
2018-09-28T10:21:26Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/473506.do
Funder
과학기술정보통신부
Funding Program
STEAM연구
Project ID
1711048704
Jurisdiction
Rep.of Korea
Project Name
Simulation study for phase-controllable active light-sources and lenses
rights
openAccess
type
article


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